Hi pal I to have just go myself an e93 m3 and looked at a few exhausts, I picked up a nearly new milltek for £400 fitted yesterday, and are really really pleased with the sound, below 4k rpm it sounds mega and above it's very much like the standard, I looked at Remus and Eisenman but both are strong money, I would really recommend a second hand , they do come up quite often on eBay. Enjoy your new M3 kid